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  1. evan_z

    Hot Topping Validation

    I have been investigating Charpy test failures in our steel foundry recently and am evaluating our process. One item of concern is a change that was made a couple years ago to our hot topping. Can someone suggest a test that can be done to validate that the hot topping is still working...
  2. evan_z

    Chromite Sand

    At the moment, we are looking into using chromite to address hot tears in some of our castings. I know that Chromite has a good effect on hot tears. My concern is that we have no way to separate it after casting and an unknown amount will end return into the molding sand. I read in one paper...
  3. evan_z

    Chromite Sand

    Is anyone familiar with whether there are adverse effects of chromite sand getting back into molding sand in steel casting applications. This can be with either green sand or Airset molding?
  4. evan_z

    Coating for Heat Treat Racks

    I am looking for an alternative to buying a different material. We can cast the racks here in a low alloy carbon steel. I am looking for a coating that can be Austenitized in a slightly oxidizing atmosphere and then quenched in water. Basically, my intention is to increase the life of the...
  5. evan_z

    Coating for Heat Treat Racks

    Can anyone suggest where I can find an anti scaling coating that can be applied to steel racks that will be austenitized and quenched in water? Thank you.
  6. evan_z

    Quench crack potential

    It's an internal alloy that got normalized prior to hardening. The cracks appeared in MPI. There was only some grinding near the crack. Secondary shrink was found after opening the crack to investigate.
  7. evan_z

    Quench crack potential

    Carbon steel quenched in water. Section thickness is 2in. Rough castings.
  8. evan_z

    Quench crack potential

    I am seeing some castings with quench cracks appearing in areas close to secondary shrink. Does anyone know if there have been studies into whether areas of secondary shrink would increase the potential for a quench crack?
  9. evan_z

    Hidden Quench cracks

    Has anyone ever heard of a quench crack that cannot be seen by wet mag? I am new to my company, and it has been said that these cracks occur after quench and temper, but can only be found if the surface is ground.
  10. evan_z

    Quench vs. Hydrogen Assisted Crack

    We are not seeing the cracks before HT in this case. There are no weld repairs. It is an area we fought hot tears in the past, so we MPI prior to HT. It is a proprietary grade. The reason I brought this question up is the similarity of a "Fish eye" to a quench crack. This part is having a...
  11. evan_z

    Quench vs. Hydrogen Assisted Crack

    we perform MPI before HT in the areas that we typically see hot tears. The parts go through Normalize and then an AQT. These cracks occur before any weld repair is done.
  12. evan_z

    Quench vs. Hydrogen Assisted Crack

    I am referring to Hydrogen Assisted Cracking.
  13. evan_z

    Quench vs. Hydrogen Assisted Crack

    I am seeing some strange cracking patterns in castings when performing MPI after the quench and temper operation. In some cases they appear similar to HAC. Can anyone suggest a way to differentiate between the two?

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